Is predicted to encode a protein with the following domains: Immunoglobulin domain; Fibronectin type III superfamily; Immunoglobulin subtype 2; Fibronectin type III domain; Immunoglobulin subtype; Fibronectin type III; Immunoglobulin-like fold; Immunoglobulin-like domain superfamily; CD80-like C2-set immunoglobulin domain; and CD80-like, immunoglobulin C2-set. Is an ortholog of C. elegans syg-2. In C. elegans, syg-2 is involved in several processes, including cell-cell adhesion; nervous system development; and protein localization to synapse.